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Could also be a bad O2 sensor.... (archive)

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Posted by B. Wheaton on June 01, 2002 at 18:09:51:

In Reply to: Black Soot on rear bumper = bad AFM????? posted by Erik Brannfors - Seattle M3 on June 01, 2002 at 12:02:08:

Noticing that after a week there is a buildup of soot on the rear bumper from the exhaust. I have searched the archives and saw that some have indivated that a b ad AFM causes this. Can I adjust it? Do I pop the cover and clean the carbon off the track under the sweeping needle? Do I adjust the screw under the "tamper proof" blue plug?

Or bite the bullet and spend $1000 on a Split Second Gen 2 MAF kit!!!! Yeah......

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